72710661 has 16 divisors (see below), whose sum is σ = 99819008. Its totient is φ = 47044800.

The previous prime is 72710657. The next prime is 72710669. The reversal of 72710661 is 16601727.

It is a happy number.

It is not a de Polignac number, because 72710661 - 2² = 72710657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72710669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72876 + ... + 73866.

It is an arithmetic number, because the mean of its divisors is an integer number (6238688).

Almost surely, 2^72710661 is an apocalyptic number.

It is an amenable number.

72710661 is a deficient number, since it is larger than the sum of its proper divisors (27108347).

72710661 is a wasteful number, since it uses less digits than its factorization.

72710661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 72710661 is about 8527.0546497604. The cubic root of 72710661 is about 417.3810214712.

The spelling of 72710661 in words is "seventy-two million, seven hundred ten thousand, six hundred sixty-one".